@article{urn:eudml:doc:38424, title = {Classification of symmetries for higher order Lagrangian systems II: The non-autonomous case.}, journal = {Extracta Mathematicae}, volume = {9}, year = {1994}, pages = {111-114}, zbl = {1027.37504}, mrnumber = {MR1325292}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:38424} }
León, Manuel de; Martín de Diego, David. Classification of symmetries for higher order Lagrangian systems II: The non-autonomous case.. Extracta Mathematicae, Tome 9 (1994) pp. 111-114. http://gdmltest.u-ga.fr/item/urn:eudml:doc:38424/